✔ 最佳答案
Hydride ion (H-) is an anion which is formed when an hydrogen atom gains an extra electron. The electronic diagram of hydride ion is:
圖片參考:
http://hk.geocities.com/hoocch2ch2cooh/diagrams/hydride_ion.jpg
Hydride ion is usually found in the ionic hydrides of reactive metals, e.g. KH, NaH and CaH2. These hydrides are strong bases, unstable, and would react with water to give hydrogen gas.
e.g. NaH(s) + H2O(l) → NaOH(aq) + H2(g)
Such metal hydrides are included in the part of inorganic chemistry in HKAL.